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交作业

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倒吃甘蔗

#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):
	
    if s[0:1]==' ':
        s=s[1:]
        return trim(s)

    elif(s[-1:]==' '):
        s=s[:-1]
        return trim(s)

    else:
        return (s)
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